Case Study: Chronic Knee Dislocations Due to Work Injury

A 31 year old male patient came into the office complaining of continuous knee pain. He also complained that his kneecap would “give out”. During the examination, we determined the problems began back in 2008 following a work injury. The patient explained that during the incident, he had twisted his knee at work, which had caused his knee to dislocate.

At the time, the patient had been treated with physical therapy and a brace. He was able to return to work following the injury but continued to suffer with the symptoms described above for years. Upon examination, it was determined that he was suffering from chronic patella instability and multiple dislocations.

As part of the examination, we noted the following:

•           Knee swelling

•           Increased patella laxity

•           Positive patellar apprehension sign

•           Increased Q angle

Before determining the exact treatment protocol, the increased Q angle indicated the need to perform a CT scan to measure the distance between the tibial tubercle and the trochlear groove. This is referred to as the T-T distance. A T-T distance greater than 2.0 cm requires the anteromedial transfer of the tibial tubercle and will decrease the T-T distance. This will encourage improved stability of patella.

It was determined that the best treatment approach was to combine two surgical procedures at the same time. The first procedure is referred to as MPFL reconstruction. The medial patellofemoral ligament or MPFL is a thin band of tissue that attaches the kneecap to the inner part of the knee. When the kneecap dislocates, it often tears the MPLF on the inside of the knee, which is important for stability in the knee. During the procedure, the MPFL is reconstructed and re-attached in the most anatomically correct position. To do this, we used a hamstring allograft and replaced the torn MPFL.

The second procedure is referred to as anterio-medialization of the tibal tubercle. The operation focuses on recentering the patella and reduces patellofemoral contact pressure. This improves the Q angle and reduces lateral vector force on the reconstructed MPFL.

The surgery proved to be a success. Following surgery, the patient was in a hinged brace and utilized crutches for 4 weeks. He then completed 12 weeks of physical therapy that was focused on edema control, range of motion and strength training. He was able to return to his job as a laborer 3 months post-op. He is currently doing extremely well and no longer suffers from patellar instability. He currently works 50-60+ hours per week without difficulty. 

ACL SURGICAL NEWS: ALLOGRAFT VS. AUTOGRAFT

When the ACL is torn, is can rarely be repaired. Surgery is often required to reconstruct the ACL. If reconstruction is not performed, the knee is at increased risk of cartilage damage, meniscal tear and osteoarthritis. Especially in younger patients, surgical repair is recommended following an ACL tear.

Surgery is performed arthroscopically and the ACL is either repaired or replaced. If the torn ligament cannot be repaired, the ACL is replaced with a tissue graft. The surgeon and patient have the option to use autograft tissue or allograft tissue.

Autograft tissue is a tendon from another location on the patient’s body. Most commonly a surgeon would use a hamstring tendon or patellar bone tendon bone. With the patellar bone tendon bone, the middle third of the tendon is removed and used as the new ACL.

Allograft tissue is a cadaver tendon that is taken from another person. In this case, the surgeon would use the achilles tendon, patellar bone tendon bone or a hamstring tendon.

Autograft is recommended for patients 30 years old or younger. The failure rate of allograft tendons is much higher in those under the age of 30 and the risk of infection is very low. The downside of using the patient’s tissue is that the operation is more involved and painful. The surgeon must surgically remove the autograft tendon and then also repair the ACL. The patient is undergoing two procedures as opposed to one. 

Allograft tendons are preferred in patients over the age of 30. The advantage of allograft is that it involves less surgical time and is less painful. The disadvantage of allograft is increased risk of infection and rejection. It is important to mention that the advances in allograft testing and sterilization have improved significantly in recent years. Risk of infection and disease is extremely low. Another advantage with allograft is that there are now numerous options to choose from, which allows the surgeon some flexibility in deciding which option is best for each individual patient.

In summary, if you are having surgery on your ACL, it is best to talk to your orthopedic surgeon about which option is best for you. Each case is unique and should be evaluated thoroughly before making a final decision.  

ACL Injury and Prevention

ACL injuries are common and on the rise. These injuries can cause young athletes to sit on the sidelines for months, lose out on valuable scholarship money and lead to long term osteoarthritis. It is estimated that over 50,000 high school and college age female athletes suffer from ACL injuries each year.[1] While some of these incidents cannot be prevented, there are steps that can be taken to reduce the number of injuries. 

One common misconception about ACL tears is that they are a result of player-to-player contact and little can be done to prevent occurrence. While ACLs are injured/torn in this manner, most occur as a result of the following: 

• Sudden change in direction
• Cutting maneuvers coupled with a sudden stop
• Awkward landing following a jump
• Pivoting with knee fully extended while foot is planted on the ground

Unfortunately, female athletes are more susceptible to ACL injury. Anatomical differences, such as a greater Q-angle, are primarily to blame. Other factors include weak muscle groups, bad habits, improper form and decreased range of motion. The good news is that while we cannot change the anatomy, we can identify risk factors and help reduce the chance of injury. 

A few suggestions for prevention would include: 

• Strength training – especially the smaller muscles around the knee and the hamstring 
•  Jump routine exercises emphasizing proper form and landing
• Pivoting exercises – also focusing on proper form

These tools are most successful when implemented in early adolescence. By utilizing prevention tools early in life, we can ensure that kids are learning proper form and technique from the beginning. This alleviates the need to undo risky habits in the future. 

Many organizations are implementing pre-season screening programs where professionals can assess athletes and determine if they are high risk for ACL injury. If you have access to one of these programs, take advantage of it and use the prevention tools provided. In future posts, we will also highlight exercises and routines that could be helpful.

---

[1] Stopsportsinjuriesnow.org

Different Types of Meniscal Tears

In a recent blog post, we discussed meniscal tears and treatment of these injuries.  Today we will take a look at the 3 different shapes of meniscal tears. To recap, the meniscus is a c-shaped piece of cartilage in the knee that acts as a cushion between the thigh bone and shin bone. The primary function of the meniscus is to keep the knee stable and act as a shock absorber.

Types of Meniscal Tears:

1.      Longitudinal 
2.      Radial 
3.      Horizontal
  
Longitudinal Meniscal Tears

A longitudinal tear runs along the meniscus.  If the longitudinal tear is partial, it can heal without surgical intervention. If it does not heal properly, however, it can often lead to a full bucket handle tear (a complete tear that goes through the meniscus). Longitudinal tears are very common in young athletes and often present in conjunction with an ACL tear.

Radial Tears

Radial Tears occur along the inner edge of the meniscus and can be either partial or full.  Two common radial tears are oblique tears and parrot’s beak tears.  Oblique tears are probably the most common type of meniscal tears.  

Horizontal Tears

This type of tear goes through the meniscus and splits the meniscus into a top and bottom section. These tears are not as common and often begin as a result of degeneration or a minor injury.  Unfortunately, if left untreated, horizontal tears can leave the patient more susceptible to the more serious horizontal flap tear and can become complicated to fix. 

Developing a Treatment Plan:

It is important to remember that there are some key factors to consider when developing a treatment plan for a meniscal tear.  These factors include:

1. Patient’s age
2. Patient’s activity level 
3. Shape/location of the tear (complex tears can be a combination of longitudinal, radial and horizontal)
4. Related injuries (if any) that are present

Age and activity level are important to the success of a surgical repair of the meniscus. The younger and more active the patient, the more likely the repair will be successful. It is also extremely important to evaluate other injuries. For example, if you repair the meniscus, but fail to repair an ACL tear, recovery will be compromised. A full evaluation of each patient is necessary to determine an appropriate treatment plan.

If you feel you have a meniscal tear, it is important to see a doctor and he/she will develop a treatment plan that is best for you. 

Why are women more susceptible to ACL tears?

In recent years, there has been discussion on why women and young girls are more susceptible to ACL tears. There are many theories on the reasons why, but today we will examine a main anatomic difference between men and women that is a contributing factor: the Q-Angle and wider pelvis.

The Q-angle is the angle at which the femur (upper leg bone) meets the tibia (lower leg bone). The Q-angle is determined by three areas of the human anatomy – the Anterior Superior Iliac Spine (ASIS), the center of the kneecap (patella) and the tibia tubercle.  The Q-angle is basically a line drawn from the ASIS down to the center of the kneecap to the tibia tubercle (see picture below).

The Q-angle in women is greater because women are anatomically built with a wider pelvis than men.  A normal Q-angle in men is 14 degrees, while women have a normal angle of 17 degrees. The greater the angle, the more at risk the person is for knee injuries, including ACL tears.

The fact that the q-angle is more pronounced in women than men leads to more stress on the knee joint and makes it less stable when put under stress. For this reason, when a woman participates in sports involving jumping, running or pivoting, she is naturally more likely to suffer an ACL tear. 

What can we do to prevent ACL tears in women?

Recently, emphasis is being placed on neuromuscular training programs.  Neuromuscular training teaches the body better biomechanic movements to improve the control of the dynamic knee stabilizers (the ACL and major ligaments that surround the knee).  Exercises that are included in a neuromuscular training program include stretching, plyometrics and strength training.  The goal of these programs is to teach athletes how to land, pivot and control the knee without placing as much force on the ACL.  One program was developed by the Santa Monica Sports Medicine Research Foundation and is known as the PEP Program: Prevent Injury and Enhance Performance. To learn more about this program, please visit http://smsmf.org/files/PEP_Program_04122011.pdf.  

If you suspect that you have an ACL tear or other orthopedic injury, it is important to see an Orthopedic Surgeon.  Skyview Orthopedic, the office of John Vitolo, MD is available to treat all your orthopedic injuries and concerns.  Our office is focused on treating each patient individually and offering the highest quality orthopedic care.  John Vitolo, MD holds dual board certification in Orthopedic Surgery and Sports Medicine. For more information call the office, 973-300-1553 or visit us online at www.skyvieworthopedic.com.

Advances in ACL Surgery: Anatomic Reconstruction

This summer, John Vitolo, M.D. attended a conference on a new ACL reconstruction technique at the University of Pittsburgh Medical Center, home to one of the largest and most respected orthopedic clinical and research departments in the United States.  Dr. Vitolo is now one of a few specialized orthopedic surgeons trained in this new surgical technique, called the “Anatomic ACL Reconstruction Method”.  

Since adopting this new procedure, Dr. Vitolo has noticed that his patients experience less post-operative pain, improved range of motion and better overall results.  Dr. Vitolo stated, “Anatomic method takes each patient’s individual anatomy into consideration and attempts to restore that natural anatomy.  By using a medial portal approach, you are able to put the new graft where the original ligament existed.  The results have been phenomenal.  Post-operative pain has decreased and my patients are recovering more quickly and returning to activities faster.”

The anatomy of every patient is different.  The “Anatomic Technique for ACL Reconstruction” looks at each patient individually and anchors the ACL to its original anatomical position by using the medial portal approach; therefore keeping the natural anatomy of the knee.  By doing this, the patient is less likely to suffer a repeat tear and is able to return to activities in less time.  It is also believed that using this new method can decrease  the risk of developing arthritis later in life. 

When the ACL is injured it cannot be repaired by fixing the original ligament.  A “new” ACL must be constructed by grafting tissue from the patient’s body (autograph) or by using tissue from a cadaver (allograft).  It has been shown that anatomic graft placement is critical to the success and clinical outcome of ACL reconstruction.

The main benefit to the new procedure is that it helps prevent a re-tear of the ACL because the graft is placed lower and mimics the body’s natural anatomy.  Non-anatomic bone tunnel placement is the most common cause of a failed ACL reconstruction.  

For more information or to schedule an appointment, please visit our website:  www.skyvieworthopedic.com or call 973.300.1553.